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Debt (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Liability and Equity Components of Convertible Debt
The following table presents details of the Notes (number of shares in millions):
Initial Conversion Price per $1,000 PrincipalInitial Conversion PriceInitial Number of Shares
2023 Notes24.0460$41.59 5.5
2025 Notes16.3875$61.02 3.8
The net carrying amounts of the liability components of the 2023 Notes and the 2025 Notes were as follows (in thousands):
As of September 30, 2020As of December 31, 2019
 2023 Notes2025 NotesTotal2023 Notes
Principal$230,000 $230,000 $460,000 $230,000 
Unamortized debt discount(33,101)(45,012)(78,113)(40,768)
Unamortized issuance costs(3,274)(5,295)(8,569)(4,032)
Net carrying amount$193,625 $179,693 $373,318 $185,200 
The net carrying amount of the equity component as of September 30, 2020 and December 31, 2019 (for the 2023 Notes only) was as follows (in thousands):
2023 Notes2025 NotesTotal
Debt discount for conversion option$53,820 $48,346 $102,166 
Issuance costs(1,626)(1,514)(3,140)
Net carrying amount$52,194 $46,832 $99,026 
Interest expense related to the 2023 Notes and the 2025 Notes was as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
20232025202320252023202520232025
NotesNotesTotalNotesNotesTotalNotesNotesTotalNotesNotesTotal
Contractual interest expense$718 $1,293 $2,011 $719 $— $719 $2,156 $2,156 $4,312 $2,156 $— $2,156 
Amortization of debt discount2,627 2,041 4,668 2,437 — 2,437 7,666 3,334 11,000 7,082 — 7,082 
Amortization of issuance costs260 241 501 242 — 242 758 393 1,151 701 — 701 
Total interest expense$3,605 $3,575 $7,180 $3,398 $— $3,398 $10,580 $5,883 $16,463 $9,939 $— $9,939 
The net impact to our stockholders' equity, included in additional paid-in capital, of the above components of the 2023 Notes and the 2025 Notes was as follows (in thousands):
2023 Notes2025 Notes
Conversion option$53,820 $48,346 
Purchase of capped calls(26,910)(27,255)
Issuance costs(1,626)(1,514)
Total $25,284 $19,577